A court on Thursday sentenced BSP MP Narendra Kashyap, his wife Devendri Devi and their son Sagar to 14 days judicial custody over the alleged dowry death of Sagar's wife Himani.
After Chief Judicial Magistrate Mohammad Kamruzzama Khan passed his order in the evening, all three were taken to the Dasna Jail in Ghaziabad.
Earlier, police arrested Rajya Sabha member Narendra Kashyap, his wife and son on charges of causing the death of Himani, 29, over dowry.
Three other accused -- younger son Siddharth and sister-in-laws Sarita and Shobha -- were said to be absconding.
Himani was found dead with a gunshot injury in her head in a bathroom of their house on Wednesday. Police said she married Sagar Kashyap about three years ago and was the mother of a year-old son.
The arrests were made after a criminal case was registered against Narendra Kashyap and his family members for killing Himani for dowry. The complaint was filed by Om Prakash, Himani's uncle.
The MP and his wife got admitted in the intensive care unit of Yashoda Hospital complaining of chest pain.
But police arrested them there after a discussion with the doctors. Sagar was arrested from the residence.
The complaint alleged that Himani was shot dead because the Kashyap family was unhappy with the dowry she had brought.
The MP's family was accused of demanding a Fortuner SUV vehicle after the wedding.
Himani's father Hira Lal Kashyap is a former Uttar Pradesh minister.
"We have registered a criminal case on charges of causing dowry death and cruelty under the Indian Penal Code and under the Dowry Prohibition Act," a police officer said.